Chapter 3, Problem 111CP

(a)

Interpretation Introduction

Interpretation:

The group of the element M in the periodic table should be identified.

Concept Introduction:

The elements are arranged in periodic table as increasing order of atomic number. The molecular formula of a compound can be used to determine the group number of the element. The number of electrons is shared and transfer for the formation of compounds such that all the atoms have complete octet.

(b)

Interpretation Introduction

Interpretation:

Name of the element $M$ should be identified.

Concept Introduction:

Molar mass is defined as average mass of atoms present in the chemical formula. It is the sum of the atomic masses of all the atoms present in the chemical formula of any compound.

The formula to calculate mass percent composition for each element is,

  $\%\text{mass}=\frac{M_1}{M_w}$